Just another suggestion 
Because: for the user should be super-ease and possible from everywhere in the forum, in every moment, to search the site and post new topics. That's why these should be permanently on the top.
The Logout could be inside My Profile as drop-down button. The avatar gives more personality. And a notifications button when you are finished with this feature. Like Quora somehow!
My 2 cents.
Just another suggestion :)
Because: for the user should be super-ease and possible from everywhere in the forum, in every moment, to search the site and post new topics. That's why these should be permanently on the top.
The Logout could be inside My Profile as drop-down button. The avatar gives more personality. And a notifications button when you are finished with this feature. Like Quora somehow!
My 2 cents.
